Finding the Fourth Proportional to 1,018.50, 1,526.88 and 433.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.50 : 1,526.88 = 433.50 : x
2. Step 2: Convert to fraction form
   1,018.50/1,526.88 = 433.50/x
3. Step 3: Cross multiply
   1,018.50x = 1,526.88 × 433.50
4. Step 4: Simplify right side
   1,018.50x = 661,902.48
5. Step 5: Solve for x
   x = 661,902.48/1,018.50
6. Step 6: Final answer
   x = 649.88